Burvey that's why I asked, I would think this is just Construct2 arranging the frames in such a way they fit best on power of 2 size png's. If referenced correctly by Construct2 the animations should be normal when playing. If the animations aren't playing correctly while playing the game, than there is an issue.

There is nothing wrong with the export. The Exporting of a C2 game will compact all the animations into a space efficient spritesheets for use in a C2 game. These sheets do not require the image sprites to be placedin order. C2 knows where the animation for what frame is and where.

C2 is not an art program, it is not sprite sheet editor, it is not an animation edit. It is a JS game tool kit. Which C2 does does fantastically well at.

Sounds like the problem was an expectation that C2 is an animation exporter which it isn't.

I took a look at it and it appears that your problem is not in the export of the image, rather it's because your collision box for your animation is not set up correctly, thus resulting in your character falling every time they reach a certain animation frame. Firstly, this results in the running animation to stop immediately and the falling animation to start before the running animation is complete, secondly, since you can't jump while falling, it means that the jump command doesn't work approximately half the time (while you're falling).